Heat exchange device



15, 1933- o. A. B ssART 1,922,838

HEAT EXCHANGE DEVICE Filed May 14, 1931 I Patented Aug. 15, 1933 UNITED STATES 1,922,838 THEAT EXCHANGE DEVICE om A. some, Racine, Wis., assignor to Modine Manufacturing Company, Racine, Wis., a 001'- poration of Wisconsin Application May 14, 1931. Serial No. 537,327 7 Claims. (Cl. 257-248) The invention relates to a heat exchange device and has among its principal objects the provision of means for increasing the rate of heat exchange between fluids in heat exchanging relation with each other.

One of the objects of the invention is to produce an extremely simple structure foraccomplishing the above mentioned result which may beem-' ployed to cool the lubricant of an internal combustion engine which is circulated in efiective heat exchanging relation with the cooling medium of the engine to thereby cool the lubricant.

It is an object of the invention to produce a means for accomplishing the above and other objects by means of a tubular element formed in a manner to provide means for increasing the rate of heat exchange between a fluid circulating through the tubular element and a fluid in heat exchanging relation with said tube, the means being arranged preferably at intervals of the length of the tube and providing means assisting circulation and agitation of the fluid circulating through the tube. V

In addition to the above it is an object of the invention to construct said tube so that fluids on opposite sides of the tube are circulated and agitated to effect efficient heat transfer from one fluid to the other.

Another object of the invention is to press a tube into a form which will accomplish the above mentioned advantages and which will also increase the distance of travel of the fluids.

Another object of the invention is to form the tube so that a relatively small quantity of one fluid is subjected to the influence of the other to thus increase the heat exchanging effect.

Another object of the invention is to construct the tube so that it is provided with means capable of functioning in the above-mentioned manner and to arrange one of said means at an angle to the other so that different portions of the fluid circulating through the tube are presented to the cooling efiect of a cooling medium during circu-' lation.

It is an object of the invention to produce a means capable of resulting in the above advantages which will not materially reduce the pressure at which the lubricant is delivered to the bearings of the, engine and other parts to be lubricated.

The invention has these and other objects, all of which will be explained in detail and more readily understood when read in conjunction with the accompanying drawing in which several embodlments of which the invention is susceptible are illustrated, it being therefore manifest that other arrangements may be resorted to without departing from the spirit of the appended claims forming a part hereof.

In the drawing,--

Fig. 1 is .a side elevation of an internal combustion engine having means capable of functioning as above outlined arranged in effective relation with the cooling medium of the engine to thereby subject the lubricant to the cooling effect of the cooling medium;

' Fig. 2 is an end view partially in section of the structure shown in Fig. 1;

Fig. 3 is a detail side elevation'of thelubricant passages illustrated in Figs. 1 and 2; 70

Figs. 4 and 5 are respectively sectional views taken on the lines 4-4 and 5-5 of Fig. 3;

Fig. 6 is a plan view of one of the tubes illustrated in Fig. 3;

Fig. 7 is a side elevation of a modified tube structure;

Figs. 8 and 9 are respectively sectional views taken on the lines 8-8 and 9-9 of Fig. 7;

Fig. 10 is a view of another side of the structure shown inFig. 3;

Fig. ll-is a section taken on line 11-11 of Fig. 4; I

Fig. 12 is a view of an internal combustion engine showing an arrangement whereby the means for cooling the lubricant is located exteriorly of the engine and arranged to be subjected to the cooling effect of air currents generated by the fan of the engine.

In the structure shown in- Figs. 1 and 2, the lubricant passages generally designated 10 are connected with the supply pipe 11 and the return pipe 12 which are part of the lubricating system, it being understood that an oil pump is interposed in the system to force the lubricant to and through the bearings of the engine and through the tubular passages 10. The engine is generally designated 13 and the water jacket thereof 14 has a wall provided with an elongated opening 15 which is closed by the structure generally designated 16, of which the tubes 10 area part.

The structure generally'designated 16 includes a cover plate 1'7 which is bolted to the water jacket of the engine and gasketed so that a leakproof'c'onnection is formed at the juncture between the water. jacket and thestructure 16. By referring to Fig. 2, it will be noted that the tubular passages 10 are located so as to be 'sub- 'ject to the cooling effect of the cooling medium circulating through the water jacket of the ention of the vehicle.

gine. This general arrangement is shown in the application of Arthur B. Modine, filed January 26, 1931, Serial Number 511,251.

By referring to Fig. 3. it will be seen that the tubular passages 10 are connected with headers respectively designated 18 and 19 and that the lubricant passages 11 and 12 are connected so as to accomplish circulation of the lubricant through said tubular passages 10.

.In the modified structure shown in Fig. 12, the tubular passages 10a are housed within a conduit 20, the opposite ends of which are respectively connected through the medium of the tubular elements 21 and 22 with the water jacket of the One advantage of the structure herein disclosed over the application above referred to, resides in the particular formation of the tubes such as those generally designated 10 and 10a. These tubes are preferably formed into the desired shape by subjecting them to the action of a forming die which will press the tubes into a form which will result in a structure capable of accomplishing an increase of the rate of heat exchange between the lubricant circulating through said tubes and the cooling medium for the engine, the latter being in direct contact with said tubes. The tubes such as 10 and 10 are formed with means arranged at intervals of the length of the tubes which provide means for subjecting a relatively small amount of lubricant to the cooling effect of the cooling medium of the engine and in addition produce circulation and agitation of the lubricant and also the cooling medium for the engine as the latter travels over in contact with said tubes. The arrangement in addition to accomplishingthe above advantages, also provides means for increasing the distance of travel of the lubricant and the cooling medium circulating in contact with the tubes. The tubes are formed to provide depressed portions which in the present instance are arranged transversely to each other and provide passages through which a relatively small quantity'of lubricant may pass during circulation through the tubes which will thus facilitate reduction of the temperature of the lubricant.

Since the formation of one of the tubes generally and respectively designated 10 and 10 corresponds in structure and result to the other, an explanation of the structure of one will sufice for an understanding of both.

The structure shown in Fig. 7 illustrates a somewhat different form from that illustrated in Figs. 1 to 3, however, it is formed of a tube which is depressed at intervals of its length as indicated at 24 and 25, and having a similarly depressed portion 27 located between the former and arranged at right angles thereto to thus provide restricted connecting portions. The various depressed portions such as 24, 25 and 27 are in communicating relation with each other and thus produce a tube having a continuous passage provided therein and which provides an outer surface with which the cooling mediunr cooperates to effect an exchange of heat from the lubricant to the cooling medium. The outer portion of the tube provides means for agitating the of the lubricant.

cooling medium circulating in contact therewith to thereby facilitate cooling of the lubricant circulating through the interior of the tube. The depressed portions such as 24, 25 and 27 provide portions which are of a more or less restricted area and thus a relatively small body of lubr'icant is subjected to the cooling effect of the cooling medium which will thus result in more rapid reduction of heat of the lubricant. It is also manifest that by virtue of the fact that the depressed portions such as 25 and 27 arearranged at right angles to each other, the lubricant is caused to be agitated during circulation through the tubes which by virtue of its contact with the relatively cool walls of the tube will thus also assist in reducing the temperature of the lubricant.

The devices shown in Figs. 3 to 6 contemplate a structure embodying the principal features of the structure shown in Fig. 7, however, differ from this structure in that the depressed portions are arranged at an angle with reference to the axis of the tube so as to provide a plurality of tortuous paths for the lubricant and provide means for causing turbulence of the lubricant and circulation thereof in a spiral like path 33 in the direction of flow of the lubricant, it being noted by referring to Figs. 3 and 6 that the angular depressed portions generally and respectively designated 29 and 30 are provided in opposed portions in the wall of the tubes and are arranged substantially transverse to each other and also extend in a direction lengthwise of the tube, at an angle providing an inclination so that lubricant circulating through the tube will be circulated in the same general direction, however, agitated during its circulation so as to present different portionsof the lubricant to the cooling effect of the cooling medium, circulating in contact with the exterior of the tube.

It will be noted that the depressed portions 29 and 30 of the tubes lOprovide restricted passages generally designated 31 and 32 which are arranged in a more or less right angle relation to each other and by virtue of their restricted area provide means for intermittently subjecting a small quantity of the lubricant to the cooling effect of the cooling medium. It will be noted that by virtue of the depressions the exterior surface of this tube is formed with undulations 34 in the surface thereof which will cause agitation of the cooling medium contacting with this surface which together with the agitation of the lubricant as it passes through the tubes, 00-- operates to facilitate an exchange of heat between the cooling medium and the commodity to be cooled which results in more rapid cooling The arrangement provides a means which does not materially reduce the pressure of the lubricant even though the lubricantis intermittently obstructed in its passage from one restricted portion to another.

From the foregoing description of the invention, it is manifest that the structure for accomplishing the above mentioned advantages is formed of a single tube having depressions provided therein at intervals of the length of the tube having certain other depressions arranged between thefirst mentioned depressions which thus provide a tube having means arranged interiorly and exteriorly thereof which cooperate to produce agitation of both the cooling medium and the commodity to be cooled and which also provides means whereby a relatively small quantity of the lubricant is subjected to cooling effect of the cooling medium and in which both the 1 cooling medium and the lubricant is circulated lengthwise of the tube to thus rapidly and effectively cause an interchange of heat between the cooling medium and the commodity to be cooled.

Having thus described the invention, what I claim and desire to cover by Letters Patent is:

1. A device of the kind described comprised of a tube formed at intervals of its length to provide passages arranged at an angle to each other, each of said passages having an inwardly projecting angularly disposed fluid engaging portion.

2. A device of the kind described comprised of a tube formed at intervals of its length to provide passages arranged at an angle to each other,

opposed walls of said passages being provided with inwardly projecting angularly disposed fluid engaging portions.

3. A device of the kind described comprised of a tube formed at intervals of its length to provide passages arranged at an angle to each other, the walls of said passages being indented in a direction lengthwise of said tube to provide an inwardly projecting element and a depression for respectively engaging fluid and directing said fluid circumferentially and lengthwise of the interior and circumferentially and lengthwise of the exterior of said tube.

4. A device of the kind described comprised of a tube formed at intervals of its length to provide angularly disposed passages, and means extending crosswise of said passages extending in the direction of travel of fluid circulating through said tube for engaging and changing the direction of travel of fluid circulating through said tube.

- 5. A device of the kind described comprised of a tube formed at intervals of its length to provide passages which are disposed at an angle to each other, and means located internally and externally of said tube arranged at an angle to said passages for engaging and changing the direction of fluid circulating lengthwise of said tube.

6'. A device of the kind described comprised of a tube formed at intervals of its length to provide passages disposed at an angle to each other, and means provided at said passages for engaging fluid circulating through said passages and forming a restriction in said passages and providing means for engaging fluid circulating relatively to the exterior of said tube and causing circulation of said fluid lengthwise and in a circumferential direction exteriorly of said tube.

'7. A device of the kind described comprised of a tube formed at intervals of its length to provide passages arranged at an angle to each other, and means extending crosswise of said passages providing a restriction in said passages and providing means for engaging fluid circulating through said passages.

OTTO A. BOSSART. 

